Try This:

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1. Give the conjugate acids for the following bases:

1. H₂PO₄^-
2. CO₃^2-

2. Give the conjugate bases for the following acids:

1. H₂PO₄^-
2. HI

3. H₂PO₄^- is listed in question 1 as a base and in question 2 as an acid. What is the name for a compound that exhibits this behavior?

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1. Add a proton, H⁺, to the base to find the conjugate acid:

1. The conjugate acid for H₂PO₄^- is H₃PO₄
2. The conjugate acid for CO₃^2- is HCO₃^-

2. Remove a proton, H⁺, from the acid to find the conjugate base.

1. The conjugate base for H₂PO₄^- is HPO₄^2-
2. The conjugate base for HI is I^-.

3. The name for a compound that can serve as both and acid and a base is amphoteric.

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